20433947 has 4 divisors (see below), whose sum is σ = 20476056. Its totient is φ = 20391840.

The previous prime is 20433943. The next prime is 20433967. The reversal of 20433947 is 74933402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20433947 - 2² = 20433943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20433943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20318 + ... + 21299.

It is an arithmetic number, because the mean of its divisors is an integer number (5119014).

Almost surely, 2^20433947 is an apocalyptic number.

20433947 is a deficient number, since it is larger than the sum of its proper divisors (42109).

20433947 is an equidigital number, since it uses as much as digits as its factorization.

20433947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42108.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 20433947 is about 4520.3923502280. The cubic root of 20433947 is about 273.3909206775.

The spelling of 20433947 in words is "twenty million, four hundred thirty-three thousand, nine hundred forty-seven".